The Center of Our Galaxy

You’re looking at the first image of the object at the heart of our galaxy, Sagittarius A—pronounced “Sagittarius A-Star”, and abbreviated Sgr A—courtesy of over 300 researchers from more than 80 institutions across the world.

The image was produced by a global research team called the Event Horizon Telescope (EHT) Collaboration, using observations from a worldwide network of radio telescopes, some of which are among the most powerful scientific instruments ever built.

The global scale of the project reflects massive ambition: The nature of what laid at the heart of our galaxy was uncertain, though a black hole was widely suspected.

Mustering humanity’s best and brightest astronomers, and its most potent tools, we now know for certain it is a supermassive black hole, the largest type of its class.

To get a sense of its scale—however possible that is—Sgr A* is four million times more massive than the Sun, which is one million times bigger than Earth. The center of the galaxy is 27,000 lightyears away, with just one lightyear stretching close to 6 TRILLION miles.
So yeah, this was a hell of an achievement, and it took hundreds of people using purpose-built tools and supercomputers over the span of five years to confirm it.

Black holes have gravity so immense that not even light can escape—hence why images of them are so hard to capture. (As @voxdotcom put it, trying to get a photo of a quarter in Los Angeles from Washington, D.C.)

Hence, we cannot the black hole itself, but only the glowing gas and other material swirling around its massive gravitation; the stuff that falls into the black hole is unseen and basically erased from the observable universe.

This is a groundbreaking moment in our understanding of these mysterious, dark giants, which are thought to reside at the center of most galaxies. Indeed, the EHT is also responsible for the very first image of a black hole, M87*, at the center of the more distant Messier 87 galaxy over 53 million lightyears away.

Such incredible achievements are only possible with collaboration and curiosity that transcends political and cultural boundaries—something we need now more than ever.

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